Android再按一次退出软件

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private static boolean isWaitingForsecond = false;

public void exitWaiting() {        if (isWaitingForsecond) {            MainActivity.this.finish();        } else {            Alert.showToast(context, context.getString(R.string.exit_msg));            isWaitingForsecond = true;            new Thread() {                @Override                public void run() {                    try {                        Thread.sleep(1200);                        handler.sendEmptyMessage(3);                    } catch (InterruptedException e) {                        e.printStackTrace();                    }                }            }.start();        }    }

@Override    public boolean onKeyDown(int keyCode, KeyEvent event) {           if (keyCode == KeyEvent.KEYCODE_BACK) {            exitWaiting();            return true;        }        return super.onKeyDown(keyCode, event);    }

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